// Loaded from https://deno.land/x/cliffy@v0.12.1/packages/x/lowerCase.ts


/**
 * via: https://github.com/blakeembrey/lower-case
 */

import { LanguageSpecific } from 'https://deno.land/x/case/types.ts';

/**
 * Special language-specific overrides.
 * Source: ftp://ftp.unicode.org/Public/UCD/latest/ucd/SpecialCasing.txt
 */
const LANGUAGES: LanguageSpecific = {
    tr: {
        regexp: /\u0130|\u0049|\u0049\u0307/g,
        map: {
            İ: '\u0069',
            I: '\u0131'
            // İ: '\u0069'
        }
    },
    az: {
        regexp: /[\u0130]/g,
        map: {
            İ: '\u0069',
            I: '\u0131'
            // İ: '\u0069'
        }
    },
    lt: {
        regexp: /[\u0049\u004A\u012E\u00CC\u00CD\u0128]/g,
        map: {
            I: '\u0069\u0307',
            J: '\u006A\u0307',
            Į: '\u012F\u0307',
            Ì: '\u0069\u0307\u0300',
            Í: '\u0069\u0307\u0301',
            Ĩ: '\u0069\u0307\u0303'
        }
    }
};

/**
 * Lowercase a string.
 *
 * @param  {String} str
 * @return {String}
 */
export default function ( str: string, locale?: string ): string {
    const lang = locale && LANGUAGES[ locale ];

    str = str == null ? '' : String( str );

    if ( lang ) {
        str = str.replace( lang.regexp, ( m: string ): string => lang.map[ m ] );
    }

    return str.toLowerCase();
}
